This section of the Flutter repository contains the command line developer tools for building Flutter applications.
Be sure to follow the instructions on CONTRIBUTING.md to set up your development environment. Further, familiarize yourself with the style guide, which we follow.
First, ensure that the Dart SDK and other necessary artifacts are available by invoking the Flutter Tools wrapper script. In this directory run:
$ flutter --version
To run Flutter Tools from source, in this directory run:
$ dart bin/flutter_tools.dart
followed by command-line arguments, as usual.
To run the analyzer on Flutter Tools, in this directory run:
$ flutter analyze
As with other parts of the Flutter repository, all changes in behavior must be tested. Tests live under the test/
subdirectory.
test/general.shard
.test/commands.shard
. Hermetic tests go under its hermetic/
subdirectory. Non-hermetic tests go under its permeable
sub-directory.test/integration.shard
.In general, the tests for the code in a file called file.dart
should go in a file called file_test.dart
in the subdirectory that matches the behavior of the test.
The integration tests can be configured to use a specific local engine variant by setting the FLUTTER_LOCAL_ENGINE
environment variable to the name of the local engine (e.g. “android_debug_unopt”). If the local engine build requires a source path, this can be provided by setting the FLUTTER_LOCAL_ENGINE_SRC_PATH
environment variable. This second variable is not necessary if the flutter
and engine
checkouts are in adjacent directories.
export FLUTTER_LOCAL_ENGINE=android_debug_unopt flutter test test/integration.shard/some_test_case
To run the tests in the test/
directory:
$ flutter test
The tests in test/integration.shard
are slower to run than the tests in test/general.shard
. Depending on your development computer, you might want to increase timeouts and limit concurrency. The integration tests also require the FLUTTER_ROOT
environment variable to be set. The full invocation to run everything might therefore look something like:
$ FLUTTER_ROOT=~/path/to/flutter-sdk $ flutter test --timeout 2x --concurrency 1
This will take about an hour to complete.
To run only the tests in test/general.shard
(which takes about a minute), in this directory run:
$ flutter test test/general.shard
To run the tests in a specific file, run:
$ flutter test test/general.shard/utils_test.dart
To force the Flutter Tools snapshot to be regenerated, delete the following files:
$ rm ../../bin/cache/flutter_tools.stamp ../../bin/cache/flutter_tools.snapshot